should not log "HttpException: User exists with same email" as error

[sentry-io]

Currently, if Keycloak rejects a request with "User exists with same email", this shows up as an error in Sentry error logs. However, this is an expected reaction that is handled and therefore shouldn't throw to this level.

Sentry Issue: AAM-DIGITAL-5E8

HttpException: User exists with same email
  File "/app/dist/utils/utils.js", line 11, in <anonymous>
    throw new common_1.HttpException(err.response.data.errorMessage, err.response.status);
...
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